This video by YouTube users ScienceForum is so amazing, it'll literally leave you dazed.
We don't want to spoil it for you, so all we'll say is watch the video, follow the instructions through to the end, and prepare to freak out (in the good way, we promise). For the best results, watch in HD and in full-screen.
Don't try this if you any medical issues like photosensitive epilepsy, though.
As seen on: iflscience
According to the source article, the effects are caused by "repeated psychological stimulation. When the video ends and you look away, your brain still expects to see the waves, and therefore it creates them for you".
We're going to watch the video again now.